Less than a day after The Intercept reported that Sen. Dianne Feinstein (D-Calif.) received a letter that purportedly details an “incident” involving Trump Supreme Court pick Brett Kavanaugh and “a woman while they were in high school,” Feinstein announced in a statement on Thursday that she has referred the secret document to the FBI.

“I have received information from an individual concerning the nomination of Brett Kavanaugh to the Supreme Court,” Feinstein said. “That individual strongly requested confidentiality, declined to come forward or press the matter further, and I have honored that decision. I have, however, referred the matter to federal investigative authorities.”

“This matter has been referred to the FBI for investigation,” Sen. Dick Durbin (D-Il.) told BuzzFeed when asked about the letter.